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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc56b8efd4beed04c397ce34cf03fc44c18b66a9b71bd6a150bcd86d95d9c2fe' 
  AND token = 'Scc+EHAUNOJkLrbIwX3J/1OHD/Bz4zzW7TEKr20JM8c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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