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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a7ea22a7995a5ddfe7d8c469b39c58e555b5e7e8b23c8c10d026ac9ca16e59b' 
  AND token = 'XTH2AhcY7HKGWaPUXd4vxUy3Fxxhff+ZAxpzhR684dE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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