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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '871f29dd9e0a7ae02ef89360092e502362375e0ee8a5e7f6890dcd37f88dfb87' 
  AND token = 'R+oZpkdSKSAE4ZluxYzz8+3mIw+4OUpQlP1ztSKl8j4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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