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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dac55f681a5ee359d53e95cc55eea8f74a4c07e97c18a71c6baca6f775ce0fe6' 
  AND token = '696euIHFsTMke8uYAUq+bVIhevFARW4sXFwKIEsLFbU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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