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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66929a13981136d0bd51f9879a4c2c43a06814bef50b108e7cb89c67cf70c6a4' 
  AND token = 'ZsT6VHSNnbxqa1nDR9MmS0sxJjCUsntxWQkzMCrZLgM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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