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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f19b4bbf0473a00236232c0c955ac5568ff8ee1ddb1b4a06b3bbeffdfed5d6aa' 
  AND token = 'LQJ1dmxM2sPelxDW8CyRwdsRfzzKkqSdlDqiyRxSoC0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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