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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20b870e5250c7de59ab24e77aaf0c48bcddaed7e5298108162dcf763ee31e847' 
  AND token = '/963jVGNxMloVFWBB8V7dhxS4eyP5xc7Agw/536ZoFA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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