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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eafc93921e65a67723e0e00de3b281a7638eaf565f42fc18edbd2c574a0a9993' 
  AND token = 'V91SmLov+gCsplmqEuyYISri9HHvY0qtUbr3yIpQQbg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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