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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '593b37b1ae13d6bbe6303608fe8bd29b9116c17adccc872caff57748eca55660' 
  AND token = '8OQSfuq6LCo15USOjutCIFhOV55ynTC4Wl38mStixQE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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