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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1915847911bb2f8db8df3f66dc727f2307983cc4f0a0005c6bec60104c99f7f9' 
  AND token = 'dWCLSFl/G9jkloYf7NV1jlLHrho5uWSYl04U+IlynZE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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