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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5e9601650acf6cf9cca37ef79e4a8b5e6866c3809e7da2ef1dd89f234c6c844' 
  AND token = 'w+JoCjUu2yC0r0JHvZUyU1fCReKS6pVUg5oJto5x2ds=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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