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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84faca2c7450242b544d934acd6c1242ab49c4f1c382212a9b0cfae9808335f5' 
  AND token = 'KMSrYSI6f0JxpBhpLQSMb9qP0VfmShXhGLz9568Z59w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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