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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ec0c71556d40c4d1c3f4a8d8db0ff9ece61283bbebbbde05274594204df76bb' 
  AND token = 'BEeKmwxwqT9RJVO+JiFRFWxuk8D2+gUTDrbn3/V9/4Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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