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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ae0cb5efb0db5d0985bc04c89bac7352321f5d74d473bd470baa71b5b5d7fbc' 
  AND token = 'ITNBBwYEhoP6uTwbJNPEMnxxf993r+yP/33BPC1xrcQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

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