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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0766c7ae1db96e9fd4f9f0cf7cf32353ddb7fd3f6d65a35156a665855075bf56' 
  AND token = '95pinX0qhjOTEHP9Qpjh/PKFAcMv0EtrHqWSIHCCSdg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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