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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9673d0b9e1f3eb8352745ac88827e4a979a2e3a88c9f06f5eee1f386acbee6ff' 
  AND token = 'RdvcrWGGgYyYQTPH8yOgZpAdydxqRNTfH2yOMoxcpjQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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