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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9197cddfb19ec7a5b031ad860781dcd74c2113537d1712d28a495d94597a74b' 
  AND token = 'An3mp/SlNgdKUFVz0PmcOlVnWstFYfu0DWOuEUVuOIQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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