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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a29fd3ab482056dd34a5ed0176b3b0d96a5386f8ef8408a1c6e31b9a4b046977' 
  AND token = 'OF1HT+YH6EAt+i1BtXtmyHEt91SVyVg3nrjsltdTX58=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}