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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24958fac94d632af5f26172e816f53e666b6cb7b1eae93eb50928922367855a2' 
  AND token = 'nX4iGV1silPUni9KjGFEQ/E2DQ4YMZc5JMbK7urs5KU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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