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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd27d5ac83b3b6abf717bbfb25463c17c9ccf6b2d3b0e3b484f9d82a82455eafe' 
  AND token = '9AYiHI2cyst/4fFKbqyAq8sJbQjXqewktP1MpDD0J/Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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