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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3b5b9f85309be985374f3d7b95fdfc99d9d666eda41a2492927b8fe4f447556' 
  AND token = 'U5JGM4Q6Qcjoa06nO4sdyU1+sCrNPU8hUuxwhDryuYs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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