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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c28493aaa5180c08e845aebc068200da098bc23ffdf55c34f50d60fbb88f403' 
  AND token = 'KBlp8y6P0GkC5yfK4CuImUcyM+5chjbsqHFf+m4jhx8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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