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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b926633950f535d9ae94f09e22ef199560ab3c240ce6c9e5efa11f28e60cf90' 
  AND token = 'y1ONb78m+ZviqyRJlu/M2J2xYtFSJSjbJpyj3CT1H38=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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