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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c79a7dffaad94e4a25890cef3f1e0197d5049a90552a67d858f40daf7cf553fb' 
  AND token = '73o17iD0XK6qq6g1tvQT1s/PVJzZhAD3rtRyn7Pia9o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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