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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7ba64738759c4c4e7024299299fe91382590e767a939c651a9861c5b7f81540' 
  AND token = '8v97diQIunAUyFvKxOmwL0fMfaY/oPRbPFIv6XVNOTw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

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