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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd77cd061b6a5429a232200714db3499bd04d7dc6ab5e8fc2a9e6f524c5a61d57' 
  AND token = 'v3wWTWhp8WbkPBNVEX6wAQmtbDcy1I6ltn7s/gtYchg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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