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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0805ffb304b8db7d02d10209462f61e7eeacc3c1c6c923ec6e901efbc5a7c4c0' 
  AND token = 'Hv1lyDKhLlgXoDm5mF6nVrXhEB8IYhrO8xNtgrWFAJY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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