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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5bd33c8541e7ac72aeb74ffd1c9b190b8519906e69eb5a7f1f520a00970e7a9d' 
  AND token = '4GEajkY5nTiumXX45jbgHLPWfy/E9C52R38fu39b8Pc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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