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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4cf691758b5d366cb4bfda212d02d78b4804eef13471b6fd98cc172fc715fdc0' 
  AND token = 'oh1z20iidp2hfhUo6g5D4xmciuXYTH6wDy7NPd+o+TU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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