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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '617299f290e9fe0c1dec3b7430324ec14eb1206ac7dc6bf2acb1e4d62a074a61' 
  AND token = 'EShdCc1KUugUfuaWf1tpUTV15Fb+ellXgHeEXbetgUc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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