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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '742ab18df9d4624a971c07de3ba1de512906891e5b75a28bdbe68829977ce7b7' 
  AND token = 's17lKizlr6akCzmefejbF2/CacEyEWax8Ts+lYQh18s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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