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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea3f0121c697a09901a0e8544ced55a241430c90e558a0a816c96ee6004aa784' 
  AND token = 'Q55Zut2FiBY+QxqIbJ4qAsZlcitZR4fTicOJRpm6K+c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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