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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '775348e9cbfc691557aee540cdd7a8183eca88902362d50f8c692851e750ee37' 
  AND token = 'eja/QPmK7mE4pgVCG97uJ3AUvKnLMEK6kxd/Odc9EVA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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