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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '954e6c1720c6ccd45e78b9fcbaf51decab1a468ac65db934946a3031a8795c3c' 
  AND token = 'J7El/eI8OvVPq3tP+YwXNV8GZ9cdL8dLv54+kHYu3es=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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