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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1fa318d1ba5c82e60f825bcb0605224672b98d2f9aedd394aff782c0705b812a' 
  AND token = 'aob/Qt1LxrB/r5FbzfTfTN5jHQaJmsBS+Gz/XkEc1fk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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