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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '218e354724aea4538538b47e0a7f9583d5a54d348b35dec32de0e23aad5e3e9f' 
  AND token = 'ud6vqNjrunuTeChpvz8r4urv73UsANP5XLmPBSCnees=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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