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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de4f4c185c4d475b4b99d77e0a136865e5e56becac465849b9c1579ca8aef2ea' 
  AND token = '8YLj7y1w95sJR6RwcwfK4cUzhroDyeON8pfpqIiCOsw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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