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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a496efad686aaf18536744df9a7d3ba79364df0cee582813b2e3375fb5ac02d' 
  AND token = '/POb3U7dhXqQKogpCetcINY0u/4Hlj3qUiZUdfRfha0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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