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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83396512038ff7530d7258d84f2f72fd4308735f179b92ffd4c475edfe4d22cd' 
  AND token = 'VcMC1mZOa4Z1Eayfr6sZ2iSIEuWKogmj1e91I557JWg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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