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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69aa5173bcf4e4968903843e57fdc4d72a70331a0329301c5a69e7e00421be5e' 
  AND token = 'S4DhCD4x1KeeNJhUjFHTi0AI5wuldD1OMpUfPPnuW5I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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