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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb4b1e818ab16b024acdf2c3c6efba581e48ef110c71df68088cf3c35949a2ce' 
  AND token = 'rIv8XHESdXewXxchsu2vx3642HGS+OuyGgyJUYjF2zQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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