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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '81a29da5ef097f4d9e5e59fc88ddd1943c8e6e60264c123a838a526cb22163de' 
  AND token = 'QXy+e7fw0IvVpI0WJdGnHI28+yDXbV+KySuGHZ4eYz4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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