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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be2db59a374c9eddef7e4650a40cc1b530a95abaa191be00bdd43571ca1f3716' 
  AND token = '1yRfTbgjRcvuq44pudkgOgbeU8XK/C+mx4Bt0jreS0o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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