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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b032510e93f8c16fdc92da2533e54a3f5cbfd11f2ba51eb15f27e95bb136a2f1' 
  AND token = 'f9A8tiukZfjT1gZGW0fJUbyPhLDDmDs31T3w1yAYasI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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